To avoid underlining individual words in the text (for example, proper names, abbreviations, special terms, and so forth), you can enter them in the Custom dictionary.
You can only add individual words to the dictionary. Phrases and word combinations cannot be added.
The words in the dictionary are case-sensitive. If a word is spelled with both lowercase and uppercase letters, it is recommended to add both spellings of the word to the dictionary.
To add a word to the Custom dictionary directly from the text, follow these steps:
1.Ensure that spell check is enabled in the application.
2.Right-click the word and select Add to dictionary from the context menu.
To add a new word directly through the dictionary itself, follow these steps:
1.Click the
button and run the Settings command from the main menu. In the Settings pane, in the Spelling and grammar block, click Custom dictionary. When working in macOS, you can also run the Tools > Custom dictionary command from the command menu.

2.In the Custom dictionary dialog box, enter the word to be added to the dictionary.
3.Click the
button or press Enter.
4.Click Done to finish editing the dictionary and close the dialog box.
